Here is the full list of all 50 Darksiders II achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Unlock Everything
Complete all Secondary Quests
Complete Sticks and Stones
Complete Lost Relics
Open all Death Tombs
Complete The Book of the Dead
Complete GnoMAD
Defeat the Soul Arbiter
Defeat Wicked K
Complete The Crucible
Death Reaches Level 30
Complete the game on APOCALYPTIC
Defeat the four creatures named by Thane
Equip elite items to all slots
Complete 3 different high dives in the Foundry
Gift An Item To A Friend
Defeat the Guardian
Defeat Archon
Defeat Samael
Defeat The Wailing Host
Defeat Absalom
Complete the game on any difficulty setting
Complete the game on NORMAL
Collect Deathgrip
Collect the Voidwalker
Collect the Phasewalker
Collect the Soul Splitter
Collect the Interdiction Stone
Complete Heart of the Mountain
Complete Tree of Life
Complete The Lord of Bones
Complete The Toll of Kings
Defeat Basileus
Complete City of the Dead
Open The Well Of Souls
Complete The Rod of Arafel
Unlock the final skill in either skill tree
Complete Stains of Heresy
Complete The Mad Queen
Complete Lord of the Black Stone
Unlock All Combat Moves & Upgrades
Your First Respec
Complete To Move a Mountain
Complete Tears of the Mountain
First use of Fast Travel
Unlock Reaper Form
Complete Fire of the Mountain
Collect Redemption
Level Up Your 1st Possessed Weapon
Defeat the Crowfather